I have been manually geotagging photos, using Picasa, and need to find a better way. I don't want to purchase new camera just to get the GPS feature.

Does anyone use an app (android) to create a GPS track of where they've been and then link to photos? Any recommendations?

I'm asking because Google Play has many of these apps. Very few downloads, very few reviews, and I don't know which one to choose. Thanks!